EP0159711A2 - Belt - Google Patents
Belt Download PDFInfo
- Publication number
- EP0159711A2 EP0159711A2 EP85105033A EP85105033A EP0159711A2 EP 0159711 A2 EP0159711 A2 EP 0159711A2 EP 85105033 A EP85105033 A EP 85105033A EP 85105033 A EP85105033 A EP 85105033A EP 0159711 A2 EP0159711 A2 EP 0159711A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- belt
- less
- load
- denier
- filament
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
- F16G1/00—Driving-belts
- F16G1/06—Driving-belts made of rubber
- F16G1/08—Driving-belts made of rubber with reinforcement bonded by the rubber
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
- F16G5/00—V-belts, i.e. belts of tapered cross-section
- F16G5/04—V-belts, i.e. belts of tapered cross-section made of rubber
- F16G5/06—V-belts, i.e. belts of tapered cross-section made of rubber with reinforcement bonded by the rubber
Definitions
- This invention relates to belts which show high resistance to flex fatigue and have good length stability.
- cords made of polyethleneterephthalate fiber are used widely as load carriers because such cords are high in modulus of elasticity and low in contractility and show high resistance to flex fatigue.
- the conventional power transmission belt uses cords of polyethyleneterephthalate fiber as load carriers but such power transmission belt shows poor resistance to flex fatigue in use under severe conditions in recent years, especially under the present trend of smaller diameter of power transmission belt and under the existence of external force to curve the power transmission belt in the direction contrary to the direction in which the pulley is curved (hereinafter referred to as "reverse bend"), and therefore it is damaged and breaks in a short period time.
- a principal object of the present invention is to provide such belts which show an improved resistance to flex fatigue (especially in driving by a pulley of smaller diameter and in reverse bend) and have good length stability.
- polyethyleneterephthalate filament is less than 15 equivalent/10 6 g in terminal carboxyl group content. If the terminal carboxyl group content exceeds 15 equivalent/10 6 g, at vulcanization in the belt manufacturing process the strength of cords reduces to a large extent due to water and consequently belt causes flex fatigue by driving for a short period of time and finally breaks.
- load carriers composed of polyethyleneterephthalate filament having such properties as mentioned above are required to be less than 5% in shrinkage percentage at dry heating, at least 6g/deaier in strength and less than 4% in elongation at a load of 2g/denier, when subjected to an adhesive treatment and to a heating and stretching treatment for 20 seconds - 10 minutes, preferably for 1 - 6 minutes, at the temperature of 200 - 2 7 0°C, preferably 220 - 250°C, and at the tension of 0.15 - 1g/denier.
- the percentage of slip at running of belt can be shown by the following formula.
- polyethyleneterephthalate filament which is used for load carriers by specifying the physical property of polyethyleneterephthalate filament which is used for load carriers and by specifying physical property of load carriers after an adhesive treatment and a heat treatment, polyethyleneterephthalate filament which constitutes load carriers before and after vulcanization reduces its strength only very slightly and has high resistance to flex fatigue.
- friction transmission belt, timing belt, transportation belt, etc. which show high resistance to flex fatigue even if driven by pulleys of small diameter and even in reverse bend, can be obtained.
- a cogged V belt 6 (upper breadth 11.0mm, height 11.0mm and angle of 35 0 ) of B type (JIS K6323), 1,016mm in length, having an upper canvas 1, an extension rubber layer 2 comprising chloroprene rubber, a load carrier layer having the load carriers mentioned above as cords, a compression rubber layer 4 comprising chloroprene rubber reinforced with short fiber and a bottom canvas 5, as shown in Fig. 1, was manufactured and treated for running.
- the above V belt 6 was stretched between the two pulleys 11 and 12, each having a diameter of 145mm and 131mm respectively.
- the pulley 11 was applied by a load of 3 horsepower and the number of revolutions of the pulley 12 was set at 1,800 r.p.m.
- cords 3 were taken out of the V belt 6 and the cord 3 at the central part was measured for strength.
- Another V belt 6 of the same composition was run for a long period of time and the running hours until the V belt 6 breaks were measured. Such running hours were regarded as the life of belt.
- the test results are shown in the following Table 3.
- the V belt according to the present invention showed nothing abnormal after running for 2,000 hours.
- belts of comparative examples 1, 2 and 3 broke after running for short hours because of a high degree of orientation of amorphous portion in the case of comparative example 1, a high bifringence rate in the case of comparative example 2 and a low ultimate viscosity of polyethyleneterephthalate filament (material yarn of cord) in the case of comparative example 3.
- strength after an adhesive treatment and a heat treatment and strength after inning for 24 hours are high and therefore belt life is comparatively long but the belt is poor in length - stability.
- a Berek compensator was inserted in the optical-path of a polarization microscope and retardation was measured in ⁇ -naphthalene bromide.
- the bifringence rate was obtained from the following formula.
- ⁇ n (N ⁇ + R)/D
- N is the number of interference band
- ⁇ is the length of optical-path of Na
- D is the diameter of filament
- R is the retardation of compensator
- a sample filament was soaked in 0.2 weight % aqueous solution of fluorescent agent (Mikephor ETN) for three hours at 55 0 C. After satisfactory rinsing, the sample filament was air-dried. Then, the sample filament was measured for the relative strength of polarizing fluorescence at 365 ⁇ m excitation wave length and 420 ⁇ m fluorescence wave length, by using a polarimeter (FOM-1 type manufactured by Nihon Bunko Kogyo K.K.). F was obtained from the following formula.
- A is the relative strength of polarizing fluorescence in fiber axial direction.
- B is the above relative strength in the direction at a right angle to the fiber axial direction.
- sample filament O.lg of sample filament was weighed accurately.
- the sample was dissolved in a test tube containing 5m1 benzyl alcohol by heating for 3 minutes at 215°C. Then, the solution was cooled abruptly to 20 - 30°C in several seconds and was put in 10ml chloroform.
- the test tube was rinsed with 5m1 heated benzyl alcohol, which was added to the above chloroform.
- This chloroform solution was titrated with 0.1N caustic soda benzyl alcohol solution, using phenol red 0.1% alcohol solution as an indicator, and the quantity of terminal carboxyl group was measured.
- a sample cord was wound in hank form. After the sample cord was left for 24 hours under the atmospheric condition of 25 0 C and 65%RH, the sample (25cm in length) was tested for tensile strength at the stretching speed of 30cm/minute by Instron 1122 type tensile strength tester (made by Instron Engineering Corporation). The elongation is the elongation at a load of 2g/denier. vi) Shrinkage percentage at dry heating
- a sample was wound in hank form. After the sample was left for 24 hours in a temperature controlled room at 20°C and 65%RH, a load which is equivalent to 0.5g/denier of sample cord was added and the length of sample I o at that time was measured. Then, after the sample cord was left for 30 minutes in a heated furnace at 150 0 C in tensionless state, it was left in the above temperature controlled room for 4 hours and again the above load was added and the length of sample I was measured.
- the shrinkage percentage was obtained from the following formula.
- the above-mentioned example is the example applied to the low edge type V belt but can be applied to a wrapped V belt (outer circumferential surface of the belt load carrier is covered with woven fabric) and also to all kinds of power transmission belt and transportation belt, such as ribbed V belt, variable speed belt, flat belt, cogged belt, etc.
Abstract
Description
- This invention relates to belts which show high resistance to flex fatigue and have good length stability.
- In general, in the field of power transmission belt cords made of polyethleneterephthalate fiber are used widely as load carriers because such cords are high in modulus of elasticity and low in contractility and show high resistance to flex fatigue.
- The recent tendency is that power transmission belts are used under severe conditions and those having higher resistance to flex fatigue have been demanded. For example, in the field of motor cars, from the energy saving point of view lightening of weight and space saving of motor cars are in progress. For this purpose, the diameter of pulley to drive the power transmission belt which is the means of transmitting power from a driving shaft to an accessory drive of engine tends to be smaller so as to make the weight of an engine lighter. This tendency, however, involves higher flexing rates of belt and more fatigue of load carriers.
- In the case where power is transmitted to a plurality of accessory drives, it was usual to provide a transmission belt for each accessory drive but the recent practice is to adopt the so-called multispindle transmitting system (to drive a plurality of accessory drives by a single belt) for space saving. Here, too, the diameter of pulley has been made smaller and this has brought more flex fatigue of load carriers of belt and earlier breakage of belt.
- In order to improve the resistance to flex fatigue of power transmission belt having cords of polyethyleneterephthalate fiber as load carriers, various measures have been taken, such as (1) to increase the number of twist of a cord (Rubber Chemistry and Technology, 42 (1), .159, 1969)t (2) to make the diameter of a cord smaller, (3) to make the ultimate viscosity larger (Japanese Patent Application Laying Open Gazette No.57-201703),and so forth.
- However, it is true that the measure (1) above improves resistance to flex fatigue but the modulus of elasticity of belt becomes low, the creep rate shows an increase and the residual elongation becomes larger. These drawbacks involve elongation of belt during use with resultant slip of belt and reduction of transmission ability. The measure (2) also improves resistance to flex fatigue but the required strength cannot be obtained in some cases. The measure (3) improves the resistance to flex fatigue to some extent but impairs the length stability of belt due to high percentage of shrinkage at dry heating. In this connection, polyethyleneterephthalate fiber which possesses high ultimate viscosity and shows a small percentage of shrinkage at dry heating is well known but load carriers made of such fiber are low in modulus of elasticity and show more slip.
- As stated above, the conventional power transmission belt uses cords of polyethyleneterephthalate fiber as load carriers but such power transmission belt shows poor resistance to flex fatigue in use under severe conditions in recent years, especially under the present trend of smaller diameter of power transmission belt and under the existence of external force to curve the power transmission belt in the direction contrary to the direction in which the pulley is curved (hereinafter referred to as "reverse bend"), and therefore it is damaged and breaks in a short period time.
- The present invention has been made to solve the problem mentioned above. A principal object of the present invention is to provide such belts which show an improved resistance to flex fatigue (especially in driving by a pulley of smaller diameter and in reverse bend) and have good length stability.
- The belt according to the present invention comprises a tension section, a compression section and a load carrier layer disposed between the foregoing two sections. Load carriers of said layer are composed of polyethyleneterephthalate filament which has at least 85 mol % of ethyleneterephthalate as repeated unit - and is at least 0.80 in ultimate viscosity, less than 0.190 in bifringence rate, less than 60 in the degree of orientation of amorphous portion and less than 15 equivalent/106 g in terminal carboxyl group content. Said load carriers are also less than 5% in shrinkage percentage at dry heating, at least 6g/denier in strength and less than 4% in elongation at a load of 2g/denier, when they were heated for 30 minutes at 150°C after they were subjected to an adhesive treatment and a heat treatment. The above applies to the case where load carriers are a single cord and where load carriers are a part of woven fabric.
- In the present invention, polyethyleneterephthalate filament which constitutes load carriers is required to have at least 85 mol %, preferably at least 95 mol %, ethyleneterephthalate as repeated unit and to be at least 0.80, preferably at least 0.85, in ultimate viscosity. As copolymerized components which constitute polyethyleneterephthalate filament, we can enumerate polyethylene glycol, diethylene glycol, etc. of carbon number 1 - 10. As dicarbonic acid components, we can enumerate isophthalic acid, adipic acid, sebacic acid, etc. When load carriers composed of polyethyleneterephthalate fiber with less than 0.80 ultimate viscosity are used, belt will show poor resistance to flex fatigue and poor strength, though it has good length stability. Therefore, if such belt is driven by a pulley of small diameter, it will break within a short period of time.
- If load carriers composed of polyethyleneterephthalate filament which is at least 0.190 in bifringence rate or at least 60 in the degree of orientation of amorphous portion, resistance to flex tatigue of belt is not improved and belt will break by driving for a short period of time. Thus, for obtaining the belt having improved resistance to flex fatigue, it is required that polyethyleneterephthalate filament which is material of load carriers must meet the specified conditions mentioned above in respect of the ultimate viscosity, bifringence rate and degree of orientation of amorphous portion.
- Furthermore, in the present invention it is preferable that polyethyleneterephthalate filament is less than 15 equivalent/106g in terminal carboxyl group content. If the terminal carboxyl group content exceeds 15 equivalent/106g, at vulcanization in the belt manufacturing process the strength of cords reduces to a large extent due to water and consequently belt causes flex fatigue by driving for a short period of time and finally breaks.
- In the present invention, load carriers composed of polyethyleneterephthalate filament having such properties as mentioned above are required to be less than 5% in shrinkage percentage at dry heating, at least 6g/deaier in strength and less than 4% in elongation at a load of 2g/denier, when subjected to an adhesive treatment and to a heating and stretching treatment for 20 seconds - 10 minutes, preferably for 1 - 6 minutes, at the temperature of 200 - 270°C, preferably 220 - 250°C, and at the tension of 0.15 - 1g/denier.
- The shrinkage percentage at dry heating means a shrinkage percentage shown when the above load carriers were heat-treated at 150°C for 30 minutes. If this shrinkage percentage is more than 5%, it is impossible to obtain power transmission belts having good length stability. Belts obtained in this case cause shrinkage with the lapse of time, with the result that they cannot be stretched between the specified pulleys.
- In cases where the belt runs under the condition of high load, tension at the tension side of belt becomes higher than in the case of conventional load condition. Therefore, if load carriers which carry the tension of belt are less than 6g/denier in strength, strength as belt is unsatisfactory and breakage of belt at an earlier stage will take place. Therefore, such load carriers are not preferable from practical use point of view.
-
- Where SP : Percentage of slip (%)
- T1 : Tension at the tension side (Kg)
- T2 : Tension at the slackening side (Kg)
- K : Spring constant of belt
- As is obvious from the above formula, reduction of K value (spring constant) involves an increase in slip percentage, with the result of earlier wear of belt and an increase in calorific value of belt which mean a shorter life of belt. The less the elongation by load of belt, the more the spring constant K and therefore it is preferable that the former is small, for example, elongation of less than 4% at a load of 2g/denier. If the elongation at a load of 2g/denier is more than 4%, elongation of belt during running is large and belt will slip in running for a short period of time, with the result that belt is easy to be damaged.
- In the present invention, in the case where load carriers are a cord, twist coefficient of the cord is set at 600 - 2,500, preferably 700 - 1,500. Twist coefficient of the cord is expressed by
- As stated above, in the belt according to the present invention, by specifying the physical property of polyethyleneterephthalate filament which is used for load carriers and by specifying physical property of load carriers after an adhesive treatment and a heat treatment, polyethyleneterephthalate filament which constitutes load carriers before and after vulcanization reduces its strength only very slightly and has high resistance to flex fatigue. Thus, friction transmission belt, timing belt, transportation belt, etc. which show high resistance to flex fatigue even if driven by pulleys of small diameter and even in reverse bend, can be obtained.
- The afore-mentioned and other objects and novel features of the present invention will be understood more clearly from the following description and accompanying drawings.
- The accompanying drawings show preferred embodiments of the present invention, in which:
- Fig. 1 is a cross sectional view of the V belt according to the present invention;
- Fig. 2 is an explanatory drawing of a running tester; and
- Fig. 3 is a graph showing the relation between the pulley diameter and the cord strength retention rate in respect of Example 1 of the V belt of the present invention and comparative Example 1 of the V belt.
- A description is made below about the embodiments of the present invention.
-
- Firstly, raw cords of 3 x 5 composition were made of 1,000-denier polyethyleneterephthalate filament yarn at 1,000 twist coefficient both for first twist and final twist. Then, the raw cords were subjected to the conventional adhesive treatment, for example, the raw cords were soaked in a first bath containing an adhesive of epoxy system or isocyanate system and in a second bath comprising RFL for an adhesive treatment, after which they were heat-treated at 225 - 250°C for 10 seconds - several minutes under the tension of 0.15 - l.Og/denier. Thus, treated cords were obtained. Then, according to the conventional method a cogged V belt 6 (upper breadth 11.0mm, height 11.0mm and angle of 350) of B type (JIS K6323), 1,016mm in length, having an upper canvas 1, an extension rubber layer 2 comprising chloroprene rubber, a load carrier layer having the load carriers mentioned above as cords, a
compression rubber layer 4 comprising chloroprene rubber reinforced with short fiber and abottom canvas 5, as shown in Fig. 1, was manufactured and treated for running. - As shown in Fig. 2, the
above V belt 6 was stretched between the twopulleys pulley 11 was applied by a load of 3 horsepower and the number of revolutions of thepulley 12 was set at 1,800 r.p.m. By pressing anidle pulley 13 of 42mm in diameter by a load of F=15 kg at the outer surface of the center of the belt, theV belt 6 was reverse bent at an angle of 120° and was run for 24 hours continuously. Then,cords 3 were taken out of theV belt 6 and thecord 3 at the central part was measured for strength. AnotherV belt 6 of the same composition was run for a long period of time and the running hours until theV belt 6 breaks were measured. Such running hours were regarded as the life of belt. The test results are shown in the following Table 3. - The V belt according to the present invention showed nothing abnormal after running for 2,000 hours. On the other hand, belts of comparative examples 1, 2 and 3 broke after running for short hours because of a high degree of orientation of amorphous portion in the case of comparative example 1, a high bifringence rate in the case of comparative example 2 and a low ultimate viscosity of polyethyleneterephthalate filament (material yarn of cord) in the case of comparative example 3. In the case of the belt of comparative example 4, strength after an adhesive treatment and a heat treatment and strength after inning for 24 hours are high and therefore belt life is comparatively long but the belt is poor in length - stability.
- In the case of the belt of comparative example 5, because of large content of terminal carboxyl group the cord strength before running to the physical property after treatment showed reduction due to hydrolysis in the vulcanizing process, with resultant reduction of belt life to a large extent.
- Then, the V belt using treated cords obtained from the above example of the present invention as load carriers and the V belt using treated cords of the comparative example 1 as load carriers were tested for resistance to flex fatigue in varying diameters of pulley. More particularly, cord strength retention rates after running for 24 hours were measured in varying diameters (30mm, 42mm, 5lmm and 60mm) of the
idler pulley 13, using a running tester as shown roughly in Fig. 2. The result is as shown in Fig. 3, from which it can be seen that the V belt of example 1 of the present invention shows a higher cord strength retention rate than the V belt of comparative example 1, irrespective of the diameter of the idler pulley. - The testing methods.employed in the above test are as shown below.
- A solution of sample (8 grams of sample filament dissolved in orthochlorophenol 100ml) was measured at 25°C for relative viscosity ηr, using a Ostwald type viscometer and η was obtained from the following formulae.
- [η] = 0.0242 ηr+ 0.2634 ηr = (t + d)/(to + do) Where t and to are the time required for flowing down and, d and do are density of the solution of sample and that of orthochlorophenol, at 25 C.
- Using a Na light source, a Berek compensator was inserted in the optical-path of a polarization microscope and retardation was measured in α-naphthalene bromide. The bifringence rate was obtained from the following formula.
- Δn = (Nλ + R)/D Where N : is the number of interference band λ : is the length of optical-path of Na D : is the diameter of filament R : is the retardation of compensator
- A sample filament was soaked in 0.2 weight % aqueous solution of fluorescent agent (Mikephor ETN) for three hours at 550C. After satisfactory rinsing, the sample filament was air-dried. Then, the sample filament was measured for the relative strength of polarizing fluorescence at 365 µm excitation wave length and 420 µm fluorescence wave length, by using a polarimeter (FOM-1 type manufactured by Nihon Bunko Kogyo K.K.). F was obtained from the following formula.
-
F = (1 - B/A) x 100 Where A : is the relative strength of polarizing fluorescence in fiber axial direction. B : is the above relative strength in the direction at a right angle to the fiber axial direction. - O.lg of sample filament was weighed accurately. The sample was dissolved in a test tube containing 5m1 benzyl alcohol by heating for 3 minutes at 215°C. Then, the solution was cooled abruptly to 20 - 30°C in several seconds and was put in 10ml chloroform. The test tube was rinsed with 5m1 heated benzyl alcohol, which was added to the above chloroform. This chloroform solution was titrated with 0.1N caustic soda benzyl alcohol solution, using phenol red 0.1% alcohol solution as an indicator, and the quantity of terminal carboxyl group was measured.
- According to JIS L-1017 Method, a sample cord was wound in hank form. After the sample cord was left for 24 hours under the atmospheric condition of 250C and 65%RH, the sample (25cm in length) was tested for tensile strength at the stretching speed of 30cm/minute by Instron 1122 type tensile strength tester (made by Instron Engineering Corporation). The elongation is the elongation at a load of 2g/denier. vi) Shrinkage percentage at dry heating
- A sample was wound in hank form. After the sample was left for 24 hours in a temperature controlled room at 20°C and 65%RH, a load which is equivalent to 0.5g/denier of sample cord was added and the length of sample Io at that time was measured. Then, after the sample cord was left for 30 minutes in a heated furnace at 1500C in tensionless state, it was left in the above temperature controlled room for 4 hours and again the above load was added and the length of sample I was measured. The shrinkage percentage was obtained from the following formula.
- Shrinkage percentage )%) = (Io - I/Io) x 100 vii) Length stability of belt Δ S
- After the belt was left for 100 hours under the atmospheric condition of 25°C and 65%RH, length variation of its inner circumference (shrinkage percentage) was measured. Length stability was obtained from the following formula, where Lo is the distance between axes after 24 hours and L is that after 1,000 hours.
ΔS={(Lo-L)/Lo} I 100 - The above-mentioned example is the example applied to the low edge type V belt but can be applied to a wrapped V belt (outer circumferential surface of the belt load carrier is covered with woven fabric) and also to all kinds of power transmission belt and transportation belt, such as ribbed V belt, variable speed belt, flat belt, cogged belt, etc.
- As the present invention can be embodied in various types without departing from its substantial characteristics, the above embodiments have been given solely for explanation purposes and are not of restrictive nature. Furthermore, as the scope of the present invention is not limited by the description made preceding the claim but is limited by the scope of claim for patent, any change in the requirements of the scope of claim for patent and equivalents to such requirements are included in the scope of claim for patent.
- What is claimed is:
Claims (1)
- A belt characterized in that it comprises a tension section, a compression section and a load carrier layer disposed between said two sections, load carriers of said load carrier layer being composed of polyethyleneterephthalate filament which has at least 85 mol % ethyleaeterephthalate as repeated unit and is at least 0.8 in ultimate viscosity, less than 0.190 in bifringence rate, less than 60 in the degree of orientation of amorphous portion and less than 15 equiralent/106g in terminal carboxyl group content, and said load carriers when heated for 30 minutes at 150°C after an adhesive treatment and a heat treatment being less than 5% in shrinkage percentage at dry heating, at least 6g/denier in strength and less than 4% in elongation at a load of 2g/denier.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP85953/84 | 1984-04-26 | ||
JP59085953A JPS60231044A (en) | 1984-04-26 | 1984-04-26 | Power transmission belt |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0159711A2 true EP0159711A2 (en) | 1985-10-30 |
EP0159711A3 EP0159711A3 (en) | 1987-07-01 |
EP0159711B1 EP0159711B1 (en) | 1989-07-26 |
Family
ID=13873116
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP85105033A Expired EP0159711B1 (en) | 1984-04-26 | 1985-04-25 | Belt |
Country Status (4)
Country | Link |
---|---|
US (1) | US4710155A (en) |
EP (1) | EP0159711B1 (en) |
JP (1) | JPS60231044A (en) |
DE (1) | DE3571859D1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0204546A1 (en) * | 1985-06-03 | 1986-12-10 | Mitsuboshi Belting Ltd. | Method of forming a power transmission belt tensile cord |
US5045138A (en) * | 1986-04-23 | 1991-09-03 | Mitsuboshi Belting Ltd. | Method of forming power transmission belt tensile cord |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH076570B2 (en) | 1989-11-17 | 1995-01-30 | 三ツ星ベルト株式会社 | Power transmission belt |
JP2000304103A (en) * | 1999-04-21 | 2000-11-02 | Bando Chem Ind Ltd | V-ribbed belt |
GB2349113B (en) * | 1999-04-21 | 2003-07-02 | Gates Corp | Wear resistant belts and a process for their manufacture |
JP3474808B2 (en) | 1999-08-19 | 2003-12-08 | バンドー化学株式会社 | Method for evaluating transmission capacity of friction transmission belt and method for supporting design of belt transmission device |
CA2434223C (en) * | 2001-01-12 | 2007-06-12 | The Gates Corporation | Low growth power transmission belt |
US6945891B2 (en) * | 2001-01-12 | 2005-09-20 | The Gates Corporation | Power transmission belt and method |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB917277A (en) * | 1959-01-02 | 1963-01-30 | Dunlop Rubber Co | Improvements in or relating to industrial belting |
US3900680A (en) * | 1972-03-08 | 1975-08-19 | Goodyear Tire & Rubber | Cord for extensible belt |
JPS57201703A (en) * | 1981-06-05 | 1982-12-10 | Sumitomo Rubber Ind Ltd | Radial tire |
DE3330844A1 (en) * | 1982-08-27 | 1984-03-01 | Nippon Zeon Co., Ltd., Tokyo | STRAPS CONTAINING RUBBER AND FIBER |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE308441C (en) * | ||||
US2726976A (en) * | 1953-07-10 | 1955-12-13 | Dayton Rubber Company | V-belts and method for manufacturing same |
NL253093A (en) * | 1959-06-26 | |||
US3433770A (en) * | 1964-06-01 | 1969-03-18 | Teijin Ltd | Addition of diaryl ester to polycondensation step of polyesterification process |
US3616832A (en) * | 1968-12-24 | 1971-11-02 | Teijin Ltd | Rubber articles reinforced with filaments |
JPS54141943A (en) * | 1978-04-26 | 1979-11-05 | Mitsuboshi Belting Ltd | Adjustless vvbelt and its manufacture |
US4522614A (en) * | 1981-03-12 | 1985-06-11 | Bando Chemical Industries, Ltd. | Automatic tension maintaining transmission belt |
JPS58136852A (en) * | 1982-02-03 | 1983-08-15 | 帝人株式会社 | Production of cord for belt |
-
1984
- 1984-04-26 JP JP59085953A patent/JPS60231044A/en active Granted
-
1985
- 1985-04-25 EP EP85105033A patent/EP0159711B1/en not_active Expired
- 1985-04-25 DE DE8585105033T patent/DE3571859D1/en not_active Expired
- 1985-04-26 US US06/727,862 patent/US4710155A/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB917277A (en) * | 1959-01-02 | 1963-01-30 | Dunlop Rubber Co | Improvements in or relating to industrial belting |
US3900680A (en) * | 1972-03-08 | 1975-08-19 | Goodyear Tire & Rubber | Cord for extensible belt |
JPS57201703A (en) * | 1981-06-05 | 1982-12-10 | Sumitomo Rubber Ind Ltd | Radial tire |
DE3330844A1 (en) * | 1982-08-27 | 1984-03-01 | Nippon Zeon Co., Ltd., Tokyo | STRAPS CONTAINING RUBBER AND FIBER |
Non-Patent Citations (1)
Title |
---|
Rubber Chemistry and Technology 42 (1969), 1, p. 159... * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0204546A1 (en) * | 1985-06-03 | 1986-12-10 | Mitsuboshi Belting Ltd. | Method of forming a power transmission belt tensile cord |
US4715176A (en) * | 1985-06-03 | 1987-12-29 | Mitsuboshi Belting Ltd. | Power transmission tensile cord and belt manufacture |
US5045138A (en) * | 1986-04-23 | 1991-09-03 | Mitsuboshi Belting Ltd. | Method of forming power transmission belt tensile cord |
Also Published As
Publication number | Publication date |
---|---|
DE3571859D1 (en) | 1989-08-31 |
EP0159711B1 (en) | 1989-07-26 |
EP0159711A3 (en) | 1987-07-01 |
JPH0214574B2 (en) | 1990-04-09 |
JPS60231044A (en) | 1985-11-16 |
US4710155A (en) | 1987-12-01 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP2514568B2 (en) | Toothed belt | |
US4790802A (en) | Power transmission belt | |
CN100436861C (en) | Power transmission belt and method | |
JPS62159827A (en) | Toothed belt | |
US6605014B2 (en) | Toothed belt | |
US20130059690A1 (en) | High Performance Toothed Belt | |
EP2297479B1 (en) | Starter alternator assembly comprising a poly-v belt and poly-v belt | |
EP0159711A2 (en) | Belt | |
US4522614A (en) | Automatic tension maintaining transmission belt | |
US4628978A (en) | Pneumatic radial tires | |
JPS6081536A (en) | Toothed belt | |
US5116286A (en) | Power transmission belt | |
JPH0942382A (en) | Belt and its tension member | |
EP0243152B2 (en) | Power transmission belt tensile cord | |
US5984816A (en) | Toothed power transmission belt and drive system using the power transmission belt | |
EP2009323A1 (en) | Core for transmission belt, and transmission belt | |
EP0204546B1 (en) | Method of forming a power transmission belt tensile cord | |
JP3451561B2 (en) | V-ribbed belt | |
JP2013199712A (en) | Cord for transmission belt and transmission belt | |
JPH09159000A (en) | Toothed belt driving gear and toothed belt | |
JPH10153243A (en) | Toothed belt driving device | |
CA1112078A (en) | Automatic tension transmission belt | |
JPH05312237A (en) | Belt for power transmission | |
KR101235054B1 (en) | Aramid multi-filament and method of manufacturing the same | |
JPS62200051A (en) | Toothed belt |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Designated state(s): DE FR GB IT SE |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): DE FR GB IT SE |
|
17P | Request for examination filed |
Effective date: 19870707 |
|
17Q | First examination report despatched |
Effective date: 19880610 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): DE FR GB IT SE |
|
ITF | It: translation for a ep patent filed |
Owner name: STUDIO CONS. BREVETTUALE S.R.L. |
|
REF | Corresponds to: |
Ref document number: 3571859 Country of ref document: DE Date of ref document: 19890831 |
|
ET | Fr: translation filed | ||
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
ITTA | It: last paid annual fee | ||
EAL | Se: european patent in force in sweden |
Ref document number: 85105033.6 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: CL |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 19980409 Year of fee payment: 14 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 19980416 Year of fee payment: 14 Ref country code: GB Payment date: 19980416 Year of fee payment: 14 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 19980504 Year of fee payment: 14 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19990425 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19990426 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 19990425 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19991231 |
|
EUG | Se: european patent has lapsed |
Ref document number: 85105033.6 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20000201 |